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' l I' L4 Mr Michael Infurna '�Z��40W�`�' April 30, 2004 Page 3 v Piping and conduit for the AS and SVE wells was installed in excavated trenches The dimensions of the trenches were approximately 18 to 24 inches deep and 30 inches wide Prior to excavation of the trenches, the asphalt surface was sawcut and placed in a segregated stockpile for disposal off-site A layer of sand bedding (-3 inches) was placed in the trenches prior to the installation of any piping The piping for the SVE operations were installed in the bottom of the trenches and consisted of 2-inch diameter Schedule 80 PVC Another layer of bedding sand (-3 inches) was placed above the SVE piping to form a base for the AS system piping, which consisted of 3/4-inch diameter Schedule 80 PVC underground and 3/4-inch diameter steel piping above ground at the distribution header A 6-inch layer of baserock fill material was placed on top of the bedding sand and the surface was resealed with asphalt At the distnbution header each individual vapor extraction well pipe was equipped with a gate valve, vacuum gauge and flow meter Piping for the sparge wells was combined (AS-1 and 2, AS-3 and 4, AS-5 and 6, AS-7, AS-8 and 9, AS-10 and 11, and AS-12 and 13) to reduce the number of pipes and the size of the trenches The only exception was well AS-7 which has a separate air delivery line The air delivery lines at the distribution header include control valves, in-line rotometers, and pressure gauges Each individual sparge well is also equipped with a gate valve at the wellhead for additional flow control A flexible hose connects the vapor extraction wells at the distribution header to the ICE unit The extracted air is routed through an air filter and a condensate knock-out drum prior to treatment by the ICE unit For initial operations, the ICE unit will be utilized to provide the vacuum for the SVE system The ICE unit will have the advantage of having built-in vapor treatment capabilities which will be sufficient for the higher hydrocarbon emissions expected at the outset of SVE operations The unit will have operating and treatment capacities of 120 scfm and 30 lbs/hr, respectively It is estimated that the ICE unit will be required for the first 6 to 10 months of SVE operations If hydrocarbon emissions do not dissipate as rapidly as expected, this unit may be required for a longer period of time If propane consumption accelerates prior to the end of 8 months, the ICE unit will be demobilized sooner For long-term operations, vacuum for the SVE System will be supplied by a regenerative blower (C-201) The blower will be powered by an explosion-proof(XP) motor with a capacity in excess of 200 scfm at an operating vacuum of 80 in w c A vacuum relief valve will protect C- 201 from excessive vacuum during operations A moisture separator (S-201) will be installed in- line prior to the blower to capture subsurface water entrained in the vapor stream An in-line particulate filter will follow S-201 The SVE equipment will be mounted on a pre-plumbed and pre-wired steel skid •